piper



- (No Model.)

B. S. PIPER.

SIGNAL LAMP.

'. No.- 249,794. Patented Nov. 22,1881.

UNI ED STATES PATENT OFFICE.

EDWARD s. PIPER, OF TORONTO, ONTARIO, CANADA.

SIGNAL-LAMP.

SPECIFICATION forming part of Letters Patent No. 249,794, dated November 22, 18 81.

' Application filed August 20, 1881. (N model.)

To all whom it may concern Be it known that I, EDWARD SPENCER PI- PER, of the city of Toronto, in the county of York, in the Province ofOntario, Canada, have invented certain new and useful Improvements in Signal-Lamps, of which the following is a specification.

The object of the invention is to provide ready and effective means for securing the lamp, glass, and reflector in position, so that the construction is perfectly air-tigh t, while the glass and reflector can be readily removed for cleaning and other purposes; and it consists, essentially, of a sheet-metal ring rolled to Form a screw fitting a corresponding screw upon the lamp where the glass is to be inserted, and having an internally-projecting flange formed for the purpose of butting against the face of the glass and holding it and the flanged rcflector in position when the ring is screwed onto the lamp, substantially as hereinafter explained.

Figure 1 are front, side, and cross-section views of the ring, glass, and reflector. Fig. 2 are detail views of the ring. Fig. 3 are similar views of the glass; and Fig. 4, like views of the reflector.

My invention has been specially designed with the view of improving the construction of a lamp already invented by me, and for which Letters Patent No. 244,142 were granted to me July 12, 1881. In this lamp I use a reflector made in the form of a frustum of a cone, and

which it is desirable should be easily got at for the purpose of cleaning the chamber.

In the drawings, A'is the glass,which, in the lamp illustrated, is a lens. This glass fits located as mentioned, the end is hermetically sealed, and no wind can. find its way through the joints to aflect the burning of the lamp within.

While my invention is specially designed for application to tail semaphore lamps, switchlamps, buffer-lamps, mast-head lamps, and, in fact, signal-lamps generally, it is also applicable to hand lamps and lamps used for other purposes.

In order to prevent the ring B unscrewing, a latch may be placed 011 the case of thelamp and arranged to engage with a notch or notches arranged around the circumference of the ring.

What I claim as my invention is- A reflector made in the form of a conic frustum and flanged at its base, and a lens or faceglass, in combination with a screw-threaded collar on the body of the lamp, and a flanged and screw-threaded ring to fit over the collar and clasp the reflector and glass between it and the said collar, substantially as described.

Witnesses: EDNV. S. PIPER.

(J. W. BALDWIN, H. H. WARREN. 

